[Bug regex/23393] Handle [a-z] and [A-Z] in consistent portable fashion regardless of locale.

["carlos at redhat dot com" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=23393

--- Comment #18 from Carlos O'Donell <carlos at redhat dot com> ---
(In reply to Carlos O'Donell from comment #17)
> Proposal (c)
> - Handle the range a-z as an alias for :lower:.
> - Handle the range A-Z as an alias for :upper:.
> - Handle the range 0-9 as an alias for :digit:.
> 
> This would bring compatibility for regex's and still allow all other
> languages to include lowe-case alphabetic symbols like ñ in Spanish without
> breaking Spanish developer scripts that depend on that.
> 
> We would be breaking scripts for the 15 locales that have mixed aA-zZ
> collation if they expect a-z to include A-Y, but the potential for breakage
> in all the other languages is worse.

>From an implementation perspective I believe we can add this in whenever we
call __collseq_table_lookup in regcomp.c, regexec.c, and fnmatch_loop.c, we
need to do the substitution if we are looking for one of the above ranges and
use a fixed range.

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